< xml version="10" > <!DOCTYPE gamelist SYSTEM "gamelistdtd"> <gamelist> <game> in Java

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< xml version="10" > <!DOCTYPE gamelist SYSTEM "gamelistdtd"> <gamelist> <game>
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<name>Gorf</name> <model>stand-up</model> <price>50050</price> </game> <game> <name>Galaga</name> <model> Cocktail</model> <price>119999</price> </game> </gamelist>
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Listing 12-4 An XML Document with an Embedded DTD
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< xml version="10" > <!DOCTYPE gameListDoc [ <!ELEMENT gameList (game)+> <!ELEMENT game (name, model, price)> <!ELEMENT name (#PCDATA)> <!ELEMENT model (#PCDATA)> <!ELEMENT price (#PCDATA)> ]> <gameList> <game> <name>Gorf</name> <model>stand-up</model> <price>50050</price> </game> <game> <name>Galaga</name> <model>cocktail</model> <price>119999</price> </game> </gameList>
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Parsing XML
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There already exist several specifications and Java APIs for parsing XML Arguably, the two most important XML parsing technologies are the Document Object Model and the Simple API for XML Parsing (SAX) Both are programmatic ways to access XML documents they differ primarily in that the former is a standard pushed by the W3C and the latter has become (implicitly) the de facto standard interface for event-driven parsing, evolving from a collective effort by participants of the XML-DEV W3C mailing list DOM The Document Object Model (DOM) is a W3C-coordinated effort to define a set of platform- and language-neutral programmatic interfaces to document data In W3C lingo, a "document" is a very general concept; HTML and XML documents are considered subclasses The DOM Working Group of the W3C publishes DOM specifications in terms of levels There are currently three levels of specifications: DOM Levels 1, 2, and 3 DOM Level 2 is the current specification, and DOM Level 3 is under development More comprehensive information about the status of W3C work on DOM can be found at http://wwww3org/DOM/Activityhtml
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The DOM represents documents as trees; a top-level node has children, each of which can have children, and so on For example, Figure 12-4 shows the DOM representation of the XML in Listing 12-4 Notice that elements are represented with boxes and data values are represented with circles Figure 12-4 DOM representation of an XML document
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The purpose of representing a document as a tree is to enable easier programmatic access to the document and to separate useful application-oriented data from any accompanying metadata Once you have parsed an XML document as a DOM tree, you can use whatever language-specific DOM binding you choose to access and update that document The W3C publishes abstract DOM interfaces as well as specific bindings for Java and C++ One key thing to remember about DOM-based XML parsing/processing, as shown by Figure 12-4, is that a tree must be created before access to the document is possible Thus, an XML document can be accessed only in a nonstreaming fashion, and enough local resources (ie, memory) must exist in order to represent and process large documents SAX The Simple API for XML Parsing is an event-driven parser interface for XML You use the SAX API to build a set of "callback functions" that are triggered as the document is being parsed Thus, in contrast to the DOM style of parsing, you don't have to wait for a tree to be built before you access document data Instead, you have access to document elements and their data during the parsing process This is an important advantage when extracting data from very large XML documents or when you want to process XML documents in a streaming fashion (ie, as the document is retrieved gradually from a remote source) A positive side effect of not having a DOM tree is that you do not have to devote memory to storing the complete tree for documents that you will access only partially Instead, since data streams in and out of a SAX parser, memory demands are relatively consistent This consistency and resource demand can again be a major advantage when querying/parsing very large documents that may exceed available memory A disadvantage to the SAX style of parsing is that you do not have access to a structure like the DOM tree at the end of the parsing process You see the elements once as they are parsed and that's it Unless you build the tree yourself (or reparse using DOM), you won't be able to query one Thus, many people believe that SAX parsing is well suited for processing one-time queries and DOM is better suited for processing multiple queries Note that SAX is a public domain API It is currently at version level 2 As of this writing, it continues to be available at http://wwwmegginsoncom/SAX/indexhtml
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XML Parsing with Apache Xerces 20 One example of an XML processor is Apache Xerces 20, which supports both DOM and SAX APIs Xerces 20 is the latest in a series of parsers supported by the Apache project (See http://wwwapacheorg/xml for more information) Listing 12-5 shows how we can use Xerces to parse the XML in Listing 12-4 under a DOM parsing methodology Listing 12-5 Parsing Using the DOM Approach
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